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Disorder Potentials near Lithographically Fabricated Atom Chips

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arxiv cond-mat/0504686 v1 pith:2IMQGO2W submitted 2005-04-26 cond-mat.other

P. Kruger , L. M. Andersson , S. Wildermuth , S. Hofferberth , E. Haller , S. Aigner , S. Groth , I. Bar-Joseph
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J. Schmiedmayer
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classification cond-mat.other
keywords atomchipsdisorderfabricatedlithographicallymagneticpotentialsvariations
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We show that previously observed large disorder potentials in magnetic microtraps for neutral atoms are reduced by about two orders of magnitude when using atom chips with lithographically fabricated high quality gold layers. Using one dimensional Bose-Einstein condensates, we probe the remaining magnetic field variations at surface distances down to a few microns. Measurements on a 100 um wide wire imply that residual variations of the current flow result from local properties of the wire.

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